Butterfly-valve for air-pipes.



v A. FAGBT. BUTTERFLY VALVE FOB AIR PIPES.

APPLICATION FILED DBO. B, 1909.

Patented Aug. 2, 1910.

- valve in its seat.

UNITED STATES PATENT OFFICE.

ARTHUR FAGET, OF SAN FRANCISCO, GALIFOBNIQ.

BUTTERFLY-VALVE FOR AIR-PRES.

Specification of Letters Patent.

Application filed December 6, 1909. Serial No. 5319128.

. Patented Aug. 2, 1910.

To all whom it may concern:

citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Butterfly-Valve for Air- Pipes, of which the following is a specificationin such full and clear terms as will enable those skilled in the art to construct and use the same. 1

This invention relates to a butterfly valve for air pipes, the object of which is to produce a very easy workin balanced valve which will produce a tight oint at low pressures, such as are used in. ventilating or airblowin systems.

Anot er object of the invention is to produce a valve which may have'a liquid seal applied thereto when the same is closed, thus avoiding'a loss of the air in the pipe.

In the drawing, in which the same numeral of reference is applied to the sameportion throughout the several views Figure 1 is a sectional view of a portion of a pipe containing the valve, showing the valve in side elevation. Fig. 2 is an end view of the ipe in which the valve is placed, the valve being closed, and showing ,.the operating handle therefor; and Fig. 3 is a sectional View of a portion of the valve at the outer edge thereof, illustrating1 the means for making a tight joint wit the edge of the The numeral 1 is applied to a casting inside of which is formed the valve seat 2. This ca'sting may have pipes 3 and 4 secured thereto, as may be desired, and at the top thereof there is a pipe 5 which leads to the liquid seal channel in the edge of the valve, as will .be explained" later. At diametrically, opposite points 6 and 7 the casting 1 is enlarged to form bearings for a shaft 8, which passes entirely through the valve, and into each of the bearings in the castin This shaft is turned by means of a han le 9. The valve is a disk 10, having three grooves 11, 12 and 13 at its outer edge. The grooves 11 and 13. are placed near the edges of the face of the valve} and in each of these grooves there is placeda rubber tube 14, said tube projecting from the edge of the disk sufiiciently to form a tight joint with the curved seat of the casting 1. The groove 12 is laced near the center of the edge of the gisk 10; this groove extends (like the grooves 11 and'13) entirely around the disk save where the shaft asses therethrough, and at this point s u cient space is provided to permit the passage of the air to all parts of the oove 12.

The operation of the'valve is as follows:

When it is desired to open the same it is simply turned by means of the handle on the shaft, the rubber tubes passing out of contact with the seat on -the castin 1. When it is desired to close the" valve it is simply turned. into the position shown in Fig. 1, and should the tubes prove to leak a small quantity of air, the liquid seal pipe may be used to fill the grooves 12 with liquid such as water or brine, and the valve will thus remain-tight, even though con; siderably worn.

The advantage of this valve, for low pressures, is that while very large, sometlmes two or three feet in diameter, 1t is balanced,

and works very easily, and is very cheaply constructed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United .States, is as follows:

1. In an air valve, an annulus having a' curved seat therein, a disk valve pivoted so that its edges will turn intoand out of contact with the valve seat, a flexible air tube at each edge of the disk which tubes are adapted to make a tight joint with the seat of the said casting, and means to supply the space between the tubes with a liquid substantially as set forth.

2. In an air valve, an annulus having a curved seat therein, a disk valve pivoted so that its ed es will turn into and out of contact with t e valve seat, an air tube at each 3. In an air valve, an annulus. having a curved seat therein, a disk valve pivoted so that its edges will turn into and out of contact with the valve seat, and having a groove therein, and means to supply a fluid to said groove when the valve is closed, making a gighlt1 joint with the said casting, as set ort In testimony whereof I have hereunto set my hand this 26th day of Nov. A. D. 1909,in the presence of the two subscribed witnesses. 10

ARTHUR FAGET.

Witnesses:

M. MACINNIS, C. P. GRIFFIN. 

